The 2003 Central American Junior and Youth Championships in Athletics were held at the Estadio Nacional in San José, Costa Rica, between September 4–6, 2003. Organized by the Central American Isthmus Athletic Confederation (CADICA), it was the 16th edition of the Junior (U-20) and the 11th edition of the Youth (U-18) competition. A total of 83 events were contested, 43 by boys and 40 by girls. The championship was held jointly with the IX Central American U-14 and U-12 Age Group Championship (Campeonato Centroamericano Infantil). Overall winner on points was Costa Rica.